CN103638917A - Lanthanum-added modified gamma-alumina catalyst coating material and preparation method thereof - Google Patents
Lanthanum-added modified gamma-alumina catalyst coating material and preparation method thereof Download PDFInfo
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- CN103638917A CN103638917A CN201310663597.3A CN201310663597A CN103638917A CN 103638917 A CN103638917 A CN 103638917A CN 201310663597 A CN201310663597 A CN 201310663597A CN 103638917 A CN103638917 A CN 103638917A
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Abstract
The invention discloses a lanthanum-added modified gamma-alumina catalyst coating material and a preparation method thereof. The lanthanum-added modified gamma-alumina catalyst coating material comprises lanthanum oxide and gamma-alumina. Through the addition of lanthanum oxide, the crystal structure of the gamma-alumina can be stabilized, so that an activated coating keeps stable at high temperature, thereby inhibiting the loss of activity. The lanthanum-added modified gamma-alumina catalyst coating material is high in specific surface area and good in high temperature aging resistance.
Description
Technical field
The invention belongs to catalyst material technical field, especially relate to a kind of lanthanum modification gamma-alumina catalyst coating material and preparation method of adding.
Background technology
The research of cleaning catalyst for tail gases of automobiles starts from the sixties in 20th century.The catalyst that first 20 century 70s are applied mainly be take the Pt-Pd oxidation catalyst that Pt, Pd are active component.Enter after the eighties in 20th century, on the basis of Pt-Pd oxidation catalyst, introduce rhodium and carry out the catalyst that some modification makes, can effectively to CO, HC and NOx, carry out catalyzed conversion simultaneously, be called as three-way catalyst simultaneously.Along with communications and transportation development also, vehicle exhaust has become large pollution sources of world today's environment.It is the effective ways that reduce vehicle exhaust environmental pollution that catalytic purification converter is installed.Catalyst type for purifying vehicle exhaust is more, and wherein noble metal (Pt, Pd, Rh) is although active high, good purification is expensive.Low containing the catalyst price of rare earth, chemistry and Heat stability is good, activity is also higher, especially anti-poisoning, the life-span is long, is a kind of cleaning catalyst for tail gases of automobiles that has very much use value and development prospect.
Gama-alumina be most widely used at present, the long-pending good coating material of effect of enlarged surface.Yet the gama-alumina that conventionally forms washcoat more than 800 ℃ can be transformed into Alpha-alumina, density is increased, surface area reduces, cause gap structure to subside, and in more than 1200 ℃ coating, can come off from carrier, air resistance is increased, catalytic activity reduces.
Summary of the invention
Object of the present invention is exactly the defect existing for prior art, provide a kind of energy to stablize the crystal structure of gama-alumina, make washcoat at high temperature keep stable, suppress loss of activity, there is high-specific surface area, a kind of lanthanum modification gamma-alumina catalyst coating material that adds that high temperature ageing resistance is good.
Another technical problem to be solved by this invention is to provide a kind of above-mentioned method that adds lanthanum modification gamma-alumina catalyst coating material of preparing.
Its technical scheme is: a kind of lanthanum modification gamma-alumina catalyst coating material that adds, comprise lanthana and γ type aluminium oxide, and wherein the part by weight of lanthana is 2-6wt%, the part by weight of γ type aluminium oxide is 94-98wt%.
The raw material of described γ type aluminium oxide is boehmite, and 600 ℃ of roastings of boehmite obtained after 3 hours, and the raw material of lanthana is the lanthanum nitrate that content is greater than 99.95%.
The part by weight of described lanthana is 3wt%, and the part by weight of γ type aluminium oxide is 97wt%.
The part by weight of described lanthana is 5wt%, and the part by weight of γ type aluminium oxide is 95wt%.
A preparation method who adds lanthanum modification gamma-alumina catalyst coating material, comprises the steps:
(1) in described boehmite is joined purifying waste water, be configured to pulp solution solid concentration at the solution of 25-35wt%;
(2) solution in described step (1) is warming up to 45-65 ℃;
(3) in lanthanum nitrate is joined purifying waste water, be configured to the lanthanum nitrate hexahydrate of 80-120 gram every liter of lanthana content, lanthanum nitrate hexahydrate is slowly joined to the solution in step (2), stir 20-30 minute;
(4) with vacuum filtration, filter, get filter cake 130 ℃ of freeze-day with constant temperature 2 hours;
(5) programming rate is controlled at 3-7 per minute ℃ and slowly rises to 600 ℃, and constant temperature calcining 3 hours obtains adding lanthanum modification gamma-alumina catalyst coating material.
Pulp solution solid concentration in described step (1) is 30wt%.
In described step (2), solution temperature is 55 ℃.
Lanthana concentration in described step (3) in lanthanum nitrate hexahydrate is 100 grams every liter.
The present invention compared with prior art, has the following advantages: by increasing lanthana, can stablize the crystal structure of gama-alumina, make washcoat at high temperature keep stable, suppress loss of activity, have high-specific surface area, high temperature ageing resistance is good.
The specific embodiment
Below in conjunction with embodiment, embodiments of the present invention are further described.
Embodiment 1:
Butt is 300 grams of 70% boehmites, dissolves in 700g pure water, obtains the slurry that solid concentration is 30wt%, is warming up to 55 ℃.63 milliliters of lanthanum nitrate hexahydrates that are 100 grams every liter by lanthana content slowly join slurry, stir 20 minutes, with vacuum filtration, filter, get filter cake 130 ℃ of freeze-day with constant temperature 2 hours, programming rate is controlled at 3-7 per minute ℃ and slowly rises to 600 ℃, constant temperature calcining 3 hours.
This material consist of 3wt% lanthana, 97wt% aluminium oxide.This fresh material state specific area is 243 square metres every gram, and this aluminium oxide is 112 square metres every gram in 24 hours specific areas of 1000 ℃ of roastings,
This aluminium oxide is 42 square metres every gram in 4 hours specific areas of 1200 ℃ of roastings,
Embodiment 2:
Butt is 300 grams of 70% boehmites, dissolves in 700g pure water, obtains the slurry that solid concentration is 30wt%, is warming up to 55 ℃.Lanthana content is 105 milliliters of the lanthanum nitrate hexahydrates of 100 grams every liter, stirs 20 minutes, with vacuum filtration, filters, and gets filter cake 130 ℃ of freeze-day with constant temperature 2 hours, and programming rate is controlled at 3-7 per minute ℃ and slowly rises to 600 ℃, constant temperature calcining 3 hours.
This material consist of 5wt% lanthana, 95wt% aluminium oxide.This fresh material state specific area is 237 square metres every gram, and this aluminium oxide is 119 square metres every gram in 24 hours specific areas of 1000 ℃ of roastings,
This aluminium oxide is 47 square metres every gram in 4 hours specific areas of 1200 ℃ of roastings,
Comparative example:
Butt is 300 grams of 70% boehmites, dissolves in 700g pure water, obtains the slurry that solid concentration is 30wt%, is warming up to 55 ℃.With vacuum filtration, filter, get filter cake 130 ℃ of freeze-day with constant temperature 2 hours, programming rate is controlled at 3-7 per minute ℃ and slowly rises to 600 ℃, constant temperature calcining 3 hours.
This material consist of 100wt% aluminium oxide.This fresh material state specific area is 240 square metres every gram, and this aluminium oxide is 64 square metres every gram in 24 hours specific areas of 1000 ℃ of roastings, and this aluminium oxide is 17 square metres every gram in 4 hours specific areas of 1200 ℃ of roastings.
Hence one can see that, can stablize the crystal structure of gama-alumina by increasing lanthana, makes washcoat at high temperature keep stable, suppresses loss of activity, has high-specific surface area, and high temperature ageing resistance is good.
The content that above-described embodiment is illustrated should be understood to these embodiment only for being illustrated more clearly in the present invention, and be not used in, limit the scope of the invention, after having read the present invention, those skilled in the art all fall within the application's claims limited range to the modification of the various equivalent form of values of the present invention.
Claims (8)
1. add a lanthanum modification gamma-alumina catalyst coating material, it is characterized in that, comprise lanthana and γ type aluminium oxide, wherein the part by weight of lanthana is 2-6wt%, and the part by weight of γ type aluminium oxide is 94-98wt%.
2. a kind of lanthanum modification gamma-alumina catalyst coating material that adds according to claim 1, it is characterized in that, the raw material of described γ type aluminium oxide is boehmite, and 600 ℃ of roastings of boehmite obtained after 3 hours, and the raw material of lanthana is the lanthanum nitrate that content is greater than 99.95%.
3. a kind of lanthanum modification gamma-alumina catalyst coating material that adds according to claim 2, is characterized in that, the part by weight of described lanthana is 3wt%, and the part by weight of γ type aluminium oxide is 97wt%.
4. a kind of lanthanum modification gamma-alumina catalyst coating material that adds according to claim 2, is characterized in that, the part by weight of described lanthana is 5wt%, and the part by weight of γ type aluminium oxide is 95wt%.
5. a kind of preparation method who adds lanthanum modification gamma-alumina catalyst coating material as described in claim 3 or 4, is characterized in that, comprises the steps:
During described boehmite is joined and purified waste water, be configured to pulp solution solid concentration at the solution of 25-35wt%;
Solution in described step (1) is warming up to 45-65 ℃;
During lanthanum nitrate is joined and purified waste water, be configured to the lanthanum nitrate hexahydrate of 80-120 gram every liter of lanthana content, lanthanum nitrate hexahydrate is slowly joined to the solution in step (2), stir 20-30 minute;
With vacuum filtration, filter, get filter cake 130 ℃ of freeze-day with constant temperature 2 hours;
Programming rate is controlled at 3-7 per minute ℃ and slowly rises to 600 ℃, and constant temperature calcining 3 hours obtains adding lanthanum modification gamma-alumina catalyst coating material.
6. a kind of preparation method who adds lanthanum modification gamma-alumina catalyst coating material according to claim 5, is characterized in that, the pulp solution solid concentration in described step (1) is 30wt%.
7. a kind of preparation method who adds lanthanum modification gamma-alumina catalyst coating material according to claim 5, is characterized in that, in described step (2), solution temperature is 55 ℃.
8. a kind of preparation method who adds lanthanum modification gamma-alumina catalyst coating material according to claim 5, is characterized in that, the lanthana concentration in described step (3) in lanthanum nitrate hexahydrate is 100 grams every liter.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021174740A1 (en) * | 2020-03-02 | 2021-09-10 | 中自环保科技股份有限公司 | Ozone purification catalyst, and preparation method therefor and application thereof |
| CN115477319A (en) * | 2022-09-16 | 2022-12-16 | 无锡成旸科技股份有限公司 | Anti-agglomeration composite powder and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1872409A (en) * | 2005-05-31 | 2006-12-06 | 中国石油化工股份有限公司 | Cleaning catalyst for tail gas of automobile, and preparation method |
| CN102491389A (en) * | 2011-11-29 | 2012-06-13 | 重庆海特汽车排气系统有限公司 | Preparation method of high-temperature-resistant alumina with large specific surface area |
-
2013
- 2013-12-10 CN CN201310663597.3A patent/CN103638917A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1872409A (en) * | 2005-05-31 | 2006-12-06 | 中国石油化工股份有限公司 | Cleaning catalyst for tail gas of automobile, and preparation method |
| CN102491389A (en) * | 2011-11-29 | 2012-06-13 | 重庆海特汽车排气系统有限公司 | Preparation method of high-temperature-resistant alumina with large specific surface area |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021174740A1 (en) * | 2020-03-02 | 2021-09-10 | 中自环保科技股份有限公司 | Ozone purification catalyst, and preparation method therefor and application thereof |
| CN115477319A (en) * | 2022-09-16 | 2022-12-16 | 无锡成旸科技股份有限公司 | Anti-agglomeration composite powder and preparation method thereof |
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Application publication date: 20140319 |